Bit-stock.



7 UNIT ED STATES PATJLN T UFFLUE.

CHARLES R. FRINK, OF BRATTLEBORO, VERMONT.

BIT-STOCK.

Specification of Letters Patent.

Patented Sept. '7, 1909.

Application filed October 27, 1908. Serial No. 459,716.

T 0 all whom it may concern:

Be it known that 1, CHARLES R. FRINK, a citizen of the United States,residing at Brattleboro, in the county of \Vindham and State of Vermont,have invented new and useful Improvements in Bit-Stocks, of which thefollowing is a specification.

This invention relates to a bit stock and more particularly to anangular screw driver whereby screws can be inserted or removedconveniently in those localities where an ordinary solid shank screwdriver is incapable of being used.

The invention has for one of its objects to improve and simplify theconstruction of devices of this character so as to be comparativelysimple and inexpensive to manufacture, reliable and efficient in use,and easily operated.

The invention consists of the novel arrangement and combination. ofparts hereinafter more fully described and set forth with particularityin the appended claim.

In the accompanying drawing, which illus trates one embodiment of theinvention, Figure 1 is a side view of the bit stock showing theapplication thereof. Fig. 2 is a central longitudinal section thereof.Fig. 3 is a sectional view on line 33, Fig. 2. Fig. 4. is a similar viewof a modified construction.

Similar reference characters are employed to designate correspondingpart-s throughout the views.

Referring to the drawing, 1 designates the rotary handle of the bitstock which is rigidly secured to a rod or shaft 2 that turns in astationary tubular member 3 that forms a grip. On one end of the member3 is an L-shaped head 4 which is provided with a reversely-arrangedL-shaped bracket 5 that cooperates with the head to form anapproximately rectangular frame. The head has a bearing opening 6through which the shaft 2 extends and on the projecting end of the shaftis a miter gear 7 which meshes with a miter gear 8 on a shortblade-carrying shaft 9. The shaft 9, which is disposed at right anglesto the shaft 2, has one end reduced to form a journal 10 that rotates ina bearing 11 in the longitudinal arm of a bracket 5, there being anannular shoulder 12 on the shaft 9 which serves to prevent lateralmovement of the said shaft in one direction, while the gear 8 bears onthe longitudinal arm or extension 13 of the head f to preventlongitudinal movement of the shaft 9 in the opposite direction. Thebracket 5 is secured to the head in any suitable manner, as forinstance, by fastening screws 14, which permit the bracket to be removedto take out the shaft 9. The arm 13 of the head is provided with anopening 15 that forms a bearing in which the screw driver blade 16 isdisposed, the said blade being provided with a socket 17 into which theshaft 9 extends and the blade and shaft are secured together by a screw18 or other suitable means, the screw being prevented from working looseby reason of its location in the bearing opening 15.

Instead of making the shaft 9 and blade 16 separate, they can be forgedor otherwise constructed in one piece, as shown in Fig. 4:. The innerend of the blade constitutes an annular shoulder against which the mitergear 8 bears and this gear and also the gear 7 are secured rigidly tothe shafts 9 and 2, respectively.

In practice, a screw to be driven or removed, is engaged by the blade 16while one hand grips the screw driver by the member or shaft 3 to steadythe screw driver. The other hand is used to impart motion to the blade16 by turning the handle 11 clockwise or anti-clockwise for moving thescrew. By turning the handle, the shaft 3 is rotated and the miter gearsrotate the shaft 9 together with the blade 16, while the frame on theend of the tubular member 3 is held stationary by the latter, which isgripped in one hand. It will thus be seen that the tool is easily andconveniently operated and is of substantial and durable construction.

Having thus described the invention, what I claim is In a bit stock ofthe class described, the combination of a tubular shank adapted to begripped in one hand, a rod extending through the shank and rotatabletherein, a handle rigidly secured to one extremity of the rod, a head onthe tubular member and provided with a plate portion extending parallelwith the axis of the said member, an L-shaped bracket having a plateportion disposed parallel with the plate portion of the head, fasteningsfor detachably securing the bracket to the head, bearings in the saidplate portions arranged in line with each other in a plane transverse tothe length of the rod, one of the bearings being larger than the other,a' bit disposed in the larger bearing, a shaft extending transversely tothe first-mentioned shaft and having one end disposed in the smallerbearing, miter gear wheels arranged on the shafts and meshing with eachother, said bit having a socket for receiving one end of thesecond-mentioned shaft, and a fastening for securing the bit on thesecond-mentioned shaft.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES R. FRINK.

Witnesses:

SHIRLEY C. Rosls, C. B. CRoWELL.

